Update to Significant Accounting Policies - Impact of Corrections on Condensed Consolidated Statements of Operations (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Apr. 01, 2018
Revenues:
Total revenues	$ 398,405	$ 450,122
Costs and expenses:
General and administrative expenses	51,135	39,996
Total costs and expenses	392,896	422,187
Operating income	5,509	28,139
Net interest expense	(6,276)	(5,075)
(Loss) income before income taxes	(767)	23,064
Income tax expense	831	4,978
Net (loss) income before attribution to noncontrolling interests	(1,598)	18,086
Net (loss) income attributable to the Company	(1,731)	17,443
Net (loss) income attributable to common shareholders	$ (3,801)	$ 17,368
Basic (loss) earnings per common share	$ (0.12)	$ 0.52
Diluted (loss) earnings per common share	$ (0.12)	$ 0.52
Domestic Company-owned restaurants
Revenues:
Total revenues	$ 161,803	$ 190,242
Costs and expenses:
Operating costs (excluding depreciation and amortization shown separately below):	133,053	157,574
Other segment
Revenues:
Total revenues	44,501	43,247
Costs and expenses:
Operating costs (excluding depreciation and amortization shown separately below):	$ 44,097	42,367
As reported
Revenues:
Total revenues		427,369
Costs and expenses:
General and administrative expenses		39,729
Total costs and expenses		400,256
Operating income		27,317
Net interest expense		(4,955)
(Loss) income before income taxes		22,362
Income tax expense		4,982
Net (loss) income before attribution to noncontrolling interests		17,380
Net (loss) income attributable to the Company		16,737
Net (loss) income attributable to common shareholders		$ 16,662
Basic (loss) earnings per common share		$ 0.50
Diluted (loss) earnings per common share		$ 0.50
As reported | Domestic Company-owned restaurants
Costs and expenses:
Operating costs (excluding depreciation and amortization shown separately below):		$ 157,319
As reported | Other segment
Revenues:
Total revenues		20,494
Costs and expenses:
Operating costs (excluding depreciation and amortization shown separately below):		20,958
Total Adjustments
Revenues:
Total revenues		22,753
Costs and expenses:
General and administrative expenses		267
Total costs and expenses		21,931
Operating income		822
Net interest expense		(120)
(Loss) income before income taxes		702
Income tax expense		(4)
Net (loss) income before attribution to noncontrolling interests		706
Net (loss) income attributable to the Company		706
Net (loss) income attributable to common shareholders		$ 706
Basic (loss) earnings per common share		$ 0.02
Diluted (loss) earnings per common share		$ 0.02
Total Adjustments | Domestic Company-owned restaurants
Costs and expenses:
Operating costs (excluding depreciation and amortization shown separately below):		$ 255
Total Adjustments | Other segment
Revenues:
Total revenues		22,753
Costs and expenses:
Operating costs (excluding depreciation and amortization shown separately below):		$ 21,409